Does an ISP keep a record of your search history? - Answers
The ISP is responsible to maintain a log simply by the fact that they want to service their customers well (assuming that is the case). There is currently no legislation or laws of any kind (that I am aware of) that FORCE an ISP to keep logs of it's users. Cable modem logs - PRIV/UNPRIV packets? - Overclock.net Apr 16, 2020 Can an ISP Remotely Access My Computer without My
In theory if you want to obfuscate such monitoring you would connect to a rooted server or a strong VPN (L2TP/IPsec, no logs) then use Tor (Tails) and all encrypted services - this way all your ISP would see is undecipherable gibberish, well they would see an enstablished connection to the VPN (which would then see you are connecting to tor).
The ISP List is a database of Internet service and other online content providers that will help you get the information you need for your case. For each Internet Service Provider listed, you’ll find the legal contact information and instructions needed to serve subpoenas, court orders, and search warrants. isp.com Login
If you really want to find out how long your ISP retains logs of your activity, you'll want to give them a call and ask. From the looks of it, some ISPs are very forthcoming with this information
Question about ISP logs and OpenDNS – OpenDNS Jun 27, 2015 Can my parents contact our ISP to view my internet history Jun 20, 2013 ISP: Home - IN.gov